Ticket #17895: 17895-function.diff

post.php

@@ -5190 +5190 @@
 }
 
 /**
+ * Removes a post thumbnail.
+ *
+ * @param int|object $post Post ID or object where thumbnail should be removed from.
+ * @return bool True on success, false on failure.
+ */
+function delete_post_thumbnail( $post ) {
+        $post = get_post( $post );
+        if ( $post ) {
+                $thumbnail_id = get_post_meta( $post->ID, '_thumbnail_id', true );
+                if ( ! empty( $thumbnail_id ) ) {
+                        delete_post_meta( $post->ID, '_thumbnail_id' );
+                        return true;
+                }
+                return true;
+        }
+        return false;
+}
+
+/**
  * Returns a link to a post format index.
  *
  * @since 3.1.0